Fantasy football keeper leagues
Never argue about keeper costs again.
KeeperSync tracks what every kept player should cost your league next draft — auto-imported from Sleeper or ESPN, or pasted in from anywhere else — and keeps the history straight across seasons, owners, and trades.
Blessed not to be blitch!
Example| Player | Drafted | Cost | Next season |
|---|---|---|---|
| Rome Odunze | Rd 7 (2025) | Rd 6 | Rd 5 |
| Amon-Ra St. Brown | Rd 2 (2025) | Rd 1 | Ineligible |
Real numbers from a real league. See the full example league →
How it works
Set it up once. Draft with the numbers.
Bring in your league
Auto-import from Sleeper or ESPN, or paste your draft results in from any other platform.
Set your keeper rule
Round decay, decay-by-2, flat carry-forward, or a fixed round — set it once per league.
Draft with the numbers
Costs stay straight across seasons, and one click prints a draft-day sheet of every team's keepers.
What you get
Built for the commissioner
Any keeper rule
Round decay, decay-by-2, flat carry-forward, or a fixed round — set it once per league.
Sleeper & ESPN import
Walks your league's full season history automatically and detects real keeper continuity.
Works with any platform
No API? Paste your draft results in — Yahoo, CBS, Fantrax, or a private league, covered.
Owner succession
An owner leaves mid-career? Hand off their spot without losing the league's history.
Trades & side bets
Log anything worth keeping on record that isn't part of the keeper math itself.
Draft-day printout
One click makes a clean, ink-friendly sheet of every team's keepers to bring to the draft.
Read the full FAQ for what it does and doesn't do.